Bolt-lock



umran STATES PATENT OFFICE.

' EARLE 8. DILL INGHAM, OF ROCHESTER, NEW YORK.

BOLT-LOCK.

To whom 2'13 concern:

Be it known that I, EARLE S. DILLINGHAM, a citizen of the United Statesresiding at Rochester, in the county of Monroe and pair of normallydiverging resilient arms,

and an important object of my invention'resldes 1n the provlsion ofmeans for prevent. mg liahe bolt becoming disengaged rom its wor'Another object of the invention resides in I the provision of meanswhereby the locking element is prevented frombecoming disengaged fromthe free ends of the bolt.

Another object of my invention is to provide a device of the abovementionedcharacter which is strong, durable, can be manuminimum cost,and'is efiicient in ractice. I

ther objects and advantages of-the invention will become apparent duringthe course of the following description.

In the accompanying drawings forming. partof a description and whereinlike nu-'.

merals are employed to designate like parts throughout the same,

.Figurel is a side elevation of my invention, the locking elementthereof being on its way to a locked position.

Fig. 2 is a slde. elevation of the invention,

. with a central section taken through the line 4-4 of Fig. 2.

d iver gi ng -relation to each-othen.

locked element. 7

Fig. 3 is an end view of Fig. 2. Fig. 4 is a transverse section taken onthe In the drawings wherein for the purpose of illustration is shownpreferred embodi- 'ment of my invention, the numeral 9 designates ingeneral the bolt, and in the present instance is shown in the form of acotter pin.

. The. bolt is constructed from a strip of springmetal, semi-circular incross section, and the intermediateportion of the strip is formed into aloop 10 so that the {remainder of the strip or the ends-form a pairof're silient arms 11. These arms extend in they same direction-and arenormally arranged-in .8

' Specification of Letters Patent.

these arms are retracted to their'extent or brought into engagement withone another, the bolt shank s'circular, in cross section.

Patented Mar. 1, 1921. Application filed may '1, 1919. Serial no.293,955. Y

The free end of each arm 11 is provided with a semi-circular enlargement12.' The curved surfaces of these enlargements are screw threaded asclearlyshown in Fig. 2,

and extend outwardly beyond the curved surfaces of the arm 11. When thearms are retracted to their extent so that the arms engage each otherthe two enlargements are drawn into engagement with each other and forma round threaded shank. The

curved surface of each of the arms 11 is provided with screw threads 13adjacent the enlargements 12 to receive the locking element 14. Thislockingelement in this instance assumes the form of a nut having athreaded bore therethrough, and when the nut is arranged upon thethreaded portion 13 of the arms, it is prevented "from moving eitheroneway or the other in view of the fact that the arms 11 no rmally divergeand'accordingly the threads thereon are jammed into close engagementwith the threaded bore through the nut. It is prevented from becomingdisengaged from the arms 11, when these arms spring into their normalposition by the nut abutting with the Inner ends of desired, to removethe nut from the arm,

the enlargements 12. However, when it is i they are simply retracted totheir extent until they engage each other, then as the two enlargementsform a round threaded shank,

the nut 14 can be readily disengaged from the-bolt, as thebore' throughthe nut is sufficient topass over or engage the threads on theenlargement 12.

The foregoing description and the drawings have reference to what may beconsid cred the preferred, or approved form of invention. It is to beunderstood that I may make such changes in construction and arrangementand combination of parts, mateshank thereof threaded and formed into a;

fully described myinvention, a secure by pair of normally divergingresilient arms,

each arm having free emkprovid'edwith a threaded semi-circularenlargement, said, In testimony'whereof I aflix my signatureelglargerient extendinlgbeyond the fsurface in presence of twoWitnesses.

0 the olt to provi e shoulders o a nut T adapted to be threaded oversaid enlarge- EARLE DILLIB GHAM" ment and upon the threaded portion ofsaid WltIlBSSBS'Z bolt and prevented from accidental displaee- HENRY W.HALL,

ment by said shoulders. RICHARD R. POWELL.

